not surprisingly, both sides claimed victory. mitt romney's campaign said biden seemed off balance and strange. the president's team said the debate exposed the risks of electing a romney/ryan ticket. the next presidential debate is tuesday. >>> while democrats are pleased with vice president biden's performance it's unclear whether his aggressive style was offensive or convincing to the independents who will hold the margin of victory in the presidential election. >> randall, let's talk more. it was obviously interesting to watch. what were the strong and weak points of the candidates? >> reporter: well, certainly vice president biden had to make sure that everyone knew that democrats would fight. i mean, remember that president obama himself said that he was too polite. no one could say that about biden as last night's showdown. ryan had to make sure he didn't lose any ground. this is his first venue for a national audience sitting opposite one of the most powerful democrats in the nation. and he held his own even as mitt romne